A grieving father (Cho Seong-ha, The Yellow Sea) seeks to understand the circumstances that led his teenage son, Ki-tae (Lee Je-hoon, The Front Line), to commit suicide. The discovery of a photo prompts him to seek out the young man's friends, Dong-yoon and Hee-june. Before viewers' eyes, a complex picture of the dynamic between them develops: Friends and foes. Bullies and victims. Brothers and strangers. What could have pushed the bond between the three young men past its breaking point?